Create siphon tables for namespace details and bulk imports

Felipe Cardozorequested to merge
fa-create_siphon_tables_for_namespace_details_and_bulk_import_entities into master

What does this MR do and why?

Create siphon tables on CH siphon_namespace_details and siphon_bulk_import_entities to replicate PG data.

References

Prepare GitLab ClickHouse DB for Siphon (gitlab-org/analytics-section/siphon#26 - closed)

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